Looks like a PCGS plastic holder to me. We do have to remember that PCGS gets its plastic holders manufactured in the same country where many U.S.-coin forgeries originate...
What exactly is your concern? Slab looks good and cert matches. I scanned the barcode and the numbers match also Maybe this website I want to share with you will help a bit - http://coinauctionshelp.com/Fake_Authentic_PCGS_Slabs.html#.VuRn47Pmqd4
